Flat umbrella shaft



FIG. 1 is a perspective view of a flat umbrella shaft showing my new design.

FIG. 2 is a front plan view thereof.

FIG. 3 is a rear plan view thereof.

FIG. 4 is a top plan view thereof.

FIG. 5 is a bottom plan view thereof.

FIG. 6 is a left side plan view thereof.

FIG. 7 is a right side plan view thereof.

FIG. 8 is an enlarged view of FIG. 6.

FIG. 9 is an enlarged view of FIG. 7; and,

FIG. 10 is an enlarged side view of each concentric segment of the shaft shown separately for clarity of illustration. 

The ornamental design for a flat umbrella shaft, as shown and described. 